公开(公告)号：US20220216518A1

公开(公告)日：2022-07-07

申请号：US17702653

申请日：2022-03-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yongkun LI ,  Kai WU ,  Shaojie TIAN

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M4/505 ,  H01M4/525 ,  H01M10/0569

Abstract: This application provides an electrolyte for lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The electrolyte provided in this application includes a non-aqueous solvent, and a lithium salt and an additive that are dissolved in the non-aqueous solvent, and the additive includes a cyclosiloxane and a fluoroether. This application further provides a lithium-ion battery including the foregoing electrolyte. In the electrolyte provided in this application, the cyclosiloxane and the fluoroether are used together to synergistically react on a surface of the positive electrode, combining silicon and oxygen containing groups and fluorine and oxygen containing groups to form an interface film containing silicon, oxygen, and fluorine, which not only ensures density of the interface film, but also strengthens oxidation resistance and thermal stability of the interface film, greatly improving both storage performance and cycling performance of the lithium-ion battery under high temperature.

公开(公告)号：US20220123364A1

公开(公告)日：2022-04-21

申请号：US17565474

申请日：2021-12-30

Applicant: Contemporary Amperex Technology Co., Limited

Inventor： Yongkun LI ,  Kai WU ,  Bo CHENG ,  Feng JU

IPC: H01M10/0567 ,  H01M10/0525 ,  H01M10/0568

Abstract: In the embodiments of the present application, an electrolyte, a lithium-ion battery comprising the electrolyte, a battery module, a battery pack, and a device are provided. The electrolyte in the embodiments of the present application comprises an organic solvent, an electrolyte lithium salt dissolved in the organic solvent, and an additive comprising a first additive and a second additive. The first additive is selected from one or more of the compounds represented by formula I, and the second additive is selected from one or more of the compounds represented by formula II. After applying the electrolyte of the present application to a lithium-ion battery, the lithium ion battery has a better cycle performance and storage performance at a high temperature, and lower direct-current impedance at a low temperature, such that the lithium ion battery has both a better high-temperature performance and a better low-temperature performance.

公开(公告)号：US20220216517A1

公开(公告)日：2022-07-07

申请号：US17702645

申请日：2022-03-23

Applicant: CONTEMPORARY AMPEREX TECHNOLOGY CO., LIMITED

Inventor： Yongkun LI ,  Kai Wu ,  Bo Cheng ,  Feng Ju

IPC: H01M10/0567 ,  H01M10/0525

Abstract: This application provides an electrolyte for lithium-ion battery, a lithium-ion battery, a battery module, a battery pack, and an apparatus. The electrolyte includes an organic solvent, an electrolytic lithium salt dissolved in the organic solvent, and additives, where the additives include a first additive and a second additive. The first additive includes an alkenyl dioxaborolane compound represented by formula I or formula II, and the second additive includes phosphoric acid cyclic anhydride represented by formula III. After the electrolyte of this application is applied to a lithium-ion battery, the lithium-ion battery can, at high voltage, have a good high-temperature cycling performance and high-temperature storage performance, a low direct current resistance, as well as good high-voltage characteristics.